EP1743948A2 - Melting furnace and method of its operation - Google Patents

Melting furnace and method of its operation Download PDF

Info

Publication number
EP1743948A2
EP1743948A2 EP06014231A EP06014231A EP1743948A2 EP 1743948 A2 EP1743948 A2 EP 1743948A2 EP 06014231 A EP06014231 A EP 06014231A EP 06014231 A EP06014231 A EP 06014231A EP 1743948 A2 EP1743948 A2 EP 1743948A2
Authority
EP
European Patent Office
Prior art keywords
melt
cover
vessel
tapping
melting furnace
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP06014231A
Other languages
German (de)
French (fr)
Other versions
EP1743948A3 (en
EP1743948B1 (en
Inventor
Norbert Uebber
Manfred Schubert
Udo Falkenreck
Jens Dr. Kempken
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Siemag AG
Original Assignee
SMS Siemag AG
SMS Demag AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SMS Siemag AG, SMS Demag AG filed Critical SMS Siemag AG
Publication of EP1743948A2 publication Critical patent/EP1743948A2/en
Publication of EP1743948A3 publication Critical patent/EP1743948A3/en
Application granted granted Critical
Publication of EP1743948B1 publication Critical patent/EP1743948B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/5211—Manufacture of steel in electric furnaces in an alternating current [AC] electric arc furnace
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D43/00—Mechanical cleaning, e.g. skimming of molten metals
    • B22D43/001—Retaining slag during pouring molten metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
    • F27B3/19—Arrangements of devices for discharging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/15—Tapping equipment; Equipment for removing or retaining slag
    • F27D3/1509—Tapping equipment
    • F27D3/1518—Tapholes
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C2005/5288—Measuring or sampling devices
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/4653—Tapholes; Opening or plugging thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the invention relates to a melting furnace, in particular an electric arc furnace for producing a melt and a method for its operation.
  • Such a melting furnace is for example from WO 03/029499 A1 known.
  • the melting furnace disclosed therein is an electric arc furnace which is designed to be tiltable for cutting off melt with an eccentrically positioned tapping channel.
  • the tapping channel is provided there in a separately attached bay, which is adjacent to a terminal wall of a furnace trough. At least one of the furnace trough and the bay connecting channel is provided to allow a tapping operation, a flow of the melt from the furnace trough into the vessel core.
  • a necessary for parting of the melt gas space in the bay is created by the fact that a pressure and vacuum-tight cover is provided on the bay.
  • To the cover a gas supply with a gas valve for supplying gas is connected in the spanned by the cover volume. The cover is attached to the bay so that the volume of gas provided by it can be provided in the vicinity of that end of the tapping passage into which the melt enters during a tapping operation.
  • the present invention seeks to further develop a known furnace with a tapping channel to the effect that a freezing or freezing of a melt in the tapping channel is prevented during a Abstichvorganges without additional heating.
  • a melting furnace according to the invention is characterized in that a part of the tapping channel is formed projecting beyond the level of the bottom of the vessel into the interior of the vessel.
  • tapping channel has the advantage that existing in the vessel melt flows around the projecting into the vessel part of the tapping channel and automatically warms up in this way. During a tapping operation, the tapping channel is then heated not only by melt flowing away in its interior, but also by melt located on its outside. The risk of freezing or freezing of the melt is thereby eliminated.
  • the melting furnace has a covering hood, which can be slipped or moved over the part of the tapping channel projecting into the interior of the vessel. It is then, for example, an evacuation of a spanned by the cover volume, into which also protrudes into the interior of the vessel projecting part of the tapping channel, possible. In this way it is possible to suck in a tapping melting even in the tapping channel into it, if their level outside the cover inside the vessel below the top of the projecting into the interior of the vessel portion of the tapping channel, but not below the lower edge the cover has sunk.
  • the cover is advantageously connected to a supply channel, via which, for example, gas can be brought into the volume or granulate spanned by the covering hood into the tapping channel.
  • a supply channel via which, for example, gas can be brought into the volume or granulate spanned by the covering hood into the tapping channel.
  • the already mentioned evacuation of the volume spanned by the cover can be realized by the supply channel.
  • the cover For the formation of a vacuum during evacuation during a tapping process, the cover must be gas-tight with the melt; For this purpose, at least its lower edge is immersed in each tapping in the melt, which has a high wear of particular this edge result. It is therefore advantageous if the cover is detachably connected to the supply channel in order to be able to easily replace it in case of excessive wear.
  • the cover preferably to be movable together with the supply channel in order to move the cover out of the melt or completely out of the vessel, if it is not required for a tapping operation, because then it is not subject to wear by the melt ,
  • the cover is immersed in the tapping process in the melt for these reasons, it must be made fireproof as a whole or at least their outer coating.
  • the melting furnace comprises a slag sensor for detecting slag flowing under the cover hood and / or a melt level sensor for detecting the level of the melt under the cover hood.
  • a slag sensor for detecting slag flowing under the cover hood
  • a melt level sensor for detecting the level of the melt under the cover hood.
  • the over the bottom level of the vessel into the interior of the vessel projecting part of the tapping channel with the remaining part of the tapping channel is releasably connected, because then a residual or emergency emptying of the vessel by mechanical elimination of the projecting into the vessel part of the tapping channel is possible.
  • the vessel in the bottom of the tapping channel is provided, formed as a vessel core and at least connected via a channel with a furnace trough of the furnace so that the melt flows during a tapping from the trough into the vessel or the vessel core.
  • the tapping can advantageously be carried out reliably in tiltable ovens, if necessary, even without a stamp.
  • conventional melting furnaces with eccentric or centric bottom tap can be equipped with a tap channel designed according to the invention and preferably also with an associated cover hood according to the invention.
  • the above object is further achieved by a method for operating a melting furnace.
  • the advantages of this process are essentially the same as those mentioned above with respect to the claimed furnace.
  • the tapping advantageously can be stopped by the introduction of inert gas in the spanned by the cover volume, controlled or interrupted.
  • FIG. 1 shows a vessel 100 of a melting furnace (not shown), designed as a vessel core, for receiving at least part of a melt.
  • the vessel core is typically mounted on an end wall of an oven trough of the furnace, in which initially collects most of the melt.
  • the furnace trough is connected to the vessel core, so that at least during a tapping process the melt 200 can also enter the vessel 100 or the vessel core.
  • the vessel core has a tapping channel 110 in the bottom of the vessel 100, wherein a part 112 of the tapping channel 110 according to the invention is formed projecting beyond the level of the bottom B of the vessel 100 into the interior of the vessel.
  • the Associated tapping channel 110 is a cover 300, which is connected to a supply channel 310 and is movable together with this in the vertical direction.
  • the cover hood, together with the supply channel 310 has moved so far in the direction of the tapping channel 110 that it is slipped over the part 112 of the tapping channel 110 projecting into the interior of the vessel core.
  • the cover hood 300 projects into the melt 200 at least temporarily during a tapping operation. It is therefore important that the cover 300 or at least an outer coating of the cover is fireproof.
  • An evacuation line 800 for evacuating a gas space 350 as part of the volume 320 spanned by the cover 300 is connected to the supply channel 310.
  • the gas space is typically formed in a between the surface of the sucked melt 200 and the remaining volume under the cover and within the supply channel 310.
  • the supply channel 310 is connected to a gas line 900 for introducing inert gas into the volume spanned by the cover 300 or into the remaining gas space 350 as part of this volume.
  • FIG. 2a shows a typical starting situation at the beginning of a tapping process.
  • Melt 200 which has formed by melting an insert in the furnace, not only collects in the furnace trough, but also due to a channel connection (not shown) between the furnace trough and the vessel 100 in this.
  • the level P of the melt lies clearly above the upper edge O of the part 112 of the tapping channel 110 projecting into the interior of the vessel core.
  • the tapping channel 110 is filled with granules 700 in FIG. 2a and closed by the tapping slide 114 pushed in front of the tapping channel 110, so that the melt 200 can not escape through the tapping channel 110.
  • the cover 300 is immersed, for example, a little way into the melt 200.
  • FIG. 2b shows a state of the vessel 100 filled with melt 200 shortly after initiation of the tapping process.
  • the tapping process was initiated by the tapping slide 114 having been displaced to the right in comparison to FIG. 2a and thus in this way releasing the tapping channel 110 initially for outflow of the granulate 700 and subsequently for outflow of the melt 200.
  • the melt 200 automatically flows by gravity through the opened tapping channel.
  • FIG. 2d a first is shown in Figure 2d.
  • This provides that in the volume above the level P of the melt under the cover 300 inert gas via the gas line 900 and the supply channel 310 is introduced.
  • the inert gas is subjected to a high pressure, which ensures that the melt is displaced from the interior of the hood 300 and in particular from the vicinity of the upper edge O of the tapping channel 110.
  • This has the consequence that the level of the melt 200 does not increase beyond the level of the top O even within the cover 300 and thus that no melt can escape through the opened tap channel 110. Instead, in this case, inert gas escapes from the tapping channel.
  • a second method, not shown in FIG. 2d, for breaking off the tapping operation is that the covering hood 300 is moved vertically with the supply channel 310 so far that even its lower edge U is no longer in the Melt dips. The interior of the cover 300 is then no longer sealed gas-tight and it can penetrate gas or air from the vessel through a gap between the cover 300 and the level of the melt in the interior of the cover 300 and displace the melt there, just like the under Referring to Figure 2d described inert gas.
  • both the gas filling via the gas line 900 according to Figure 2d as well as the method of the cover 300 are above the melt level P outside the hood for comfortable breaking off, interrupting or controlling the Abstichvorganges or the outflow of the melt 200.
  • the tapping is finally terminated by Closing the tapping channel 110 with the tapping slide 114 and filling the tapping channel 110 preferably through the supply channel 310 with granules 700 (see Figure 2e).
  • the cover 300 with the supply channel 310 is advantageously moved away from the surroundings of the tapping channel 110 so far that it does not necessarily come into contact with the melt 200 even when the vessel 100 is subsequently filled with melt 200.
  • This, as well as complete removal of the cover from the interior of the vessel core, has the advantage of minimizing its wear, which it otherwise suffers when immersed in the melt.
  • FIGS. 3a and 3b relate to the control of a tapping process by means of a control device 600 when slag 210 penetrates into the interior of the cover hood 300.
  • an optical slag sensor 400 is preferably provided, which houses the surface of the melt inside the hood the presence of slag 210 is scanned or investigated. With this sensor, the penetration of slag can be detected promptly by changing the emissivity. Will the intrusion or afterflow of slag 210 detected under the cover 300, the control device 600 causes in response to a corresponding signal of the slag sensor 400 immediately interrupting or canceling the Abstichvorganges.
  • FIG. 3b An example of the cancellation of the tapping operation in this case is shown in Figure 3b, after which the control means 600 initiates the termination of the tapping operation by opening the gas pipe 900; Compare the above description of a termination of the parting off process according to FIG. 2d.
  • Inert gas is introduced under pressure into the supply channel 310 and the gas space 350 in the interior of the cover above the slag 210, whereby the melt is at least largely displaced from the volume spanned by the cover 300 and the tapping channel with the slag 210 floating on it.
  • the relatively small slag volume below the cover 300 lead to particularly small slag residues 210-R during tapping.
  • the melt flow may be more precisely controlled by having at least one melt level sensor mounted in the cover 300 or in the supply channel 310 for detecting the level of the melt 200 below Covering hood 300.
  • the traveling position of the cover hood 300 and the supply passage 310 is then controlled by the control device 600.
  • the melt level sensor may be formed as a distance sensor, which preferably detects the level P of the melt 200 through the supply channel 310.
  • the melt level sensor 500 may be formed in the form of preferably a plurality of contacts mounted at different levels within the cover 300, which in contact with the melt 200 generates an electrical signal to the controller 600.
  • the melt level sensor can also be designed as a vacuum sensor, which determines the level of the melt 200 under the cover 300 in accordance with the size of the negative pressure or in accordance with a change in the negative pressure detected under the cover.
  • An indication that the lower edge U of the cover 300 has reached the level P of the melt 200 when lowering the cover 300 is given when the interior of the cover 300 is evacuated during the lowering of the hood and the melt level sensor 500 at a certain time detects a sudden drop in pressure inside the hood.
  • the drop in pressure is then based on closing the interior of the hood 300 in such a way that the lower edge of the hood dips into the melt. From this point on, the evacuation process for sucking the melt into the interior of the hood 300 can then continue or take place as described above.
  • a siphon operation always brings a higher flow resistance due to the associated multiple flow direction diversion of the melt than a straight tapping channel.
  • the described concept for controlling a tapping process is characterized overall by a comparatively low-resistance outflow of the melt 200, because the melt at the beginning of a Abstichvorganges, that is, at least as long as their level P is above the upper edge O of the part 112, due to gravity through the rectilinear tapping channel 110 can flow relatively frictionless and a siphon operation with greater flow resistance during this time is avoided.
  • a siphon operation is proposed by lowering the hood 300 over the part 112 of the tapping channel 110 only towards the end of the tapping operation, when the level of the melt P is between the level of the top edge of the part 112 and the level of the bottom edge of the cover 300. Seen over the entire Abstichzeitraum therefore the flow resistance in the tapping concept described is much lower than in an alternative stationary siphon operation according to the invention, in which the cover would be fixedly placed over the part 112 and formed not movable.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Furnace Charging Or Discharging (AREA)

Abstract

Arc furnace, for use in smelting, has a tapping pipe (110) with a section (112) which projects above the furnace floor (B). An independent claim is included for a method for operating the furnace in which smelt (200) is produced which covers the projecting section of the tapping pipe on the outside before flowing down it.

Description

Die Erfindung betrifft einen Schmelzofen, insbesondere einen Lichtbogenofen zum Erzeugen einer Schmelze und ein Verfahren zu dessen Betrieb.The invention relates to a melting furnace, in particular an electric arc furnace for producing a melt and a method for its operation.

Ein derartiger Schmelzofen ist zum Beispiel aus der WO 03/029499 A1 bekannt. Bei dem dort offenbarten Schmelzofen handelt es sich um einen Lichtbogenofen, der zum Abstechen von Schmelze kippbar mit einem exzentrisch positionierten Abstichkanal ausgebildet ist. Der Abstichkanal ist dort in einem separat angebauten Erker vorgesehen, welcher an eine Abschlusswand einer Ofenwanne angrenzt. Zumindest ein die Ofenwanne und den Erker verbindender Kanal ist vorgesehen, um bei einem Abstichvorgang ein Fließen der Schmelze von der Ofenwanne in den Gefäßerker zu ermöglichen. Ein zum Abstechen der Schmelze notwendiger Gasraum in dem Erker wird dadurch geschaffen, dass auf dem Erker eine druck- und vakuumdichte Abdeckhaube vorgesehen ist. An die Abdeckhaube ist eine Gaszuführung mit einem Gasventil zum Zuführen von Gas in das von der Abdeckhaube aufgespannte Volumen angeschlossen. Die Abdeckhaube ist so an dem Erker angebracht, dass das von ihr bereitgestellte Gasvolumen in der Umgebung desjenigen Endes des Abstichkanals bereitgestellt werden kann, in welches die Schmelze bei einem Abstichvorgang eintritt.Such a melting furnace is for example from WO 03/029499 A1 known. The melting furnace disclosed therein is an electric arc furnace which is designed to be tiltable for cutting off melt with an eccentrically positioned tapping channel. The tapping channel is provided there in a separately attached bay, which is adjacent to a terminal wall of a furnace trough. At least one of the furnace trough and the bay connecting channel is provided to allow a tapping operation, a flow of the melt from the furnace trough into the vessel core. A necessary for parting of the melt gas space in the bay is created by the fact that a pressure and vacuum-tight cover is provided on the bay. To the cover a gas supply with a gas valve for supplying gas is connected in the spanned by the cover volume. The cover is attached to the bay so that the volume of gas provided by it can be provided in the vicinity of that end of the tapping passage into which the melt enters during a tapping operation.

Aufgabetask

Ausgehend von diesem Stand der Technik liegt der Erfindung die Aufgabe zugrunde, einen bekannten Schmelzofen mit einem Abstichkanal dahingehend weiterzubilden, dass ein Ein- oder Anfrieren einer Schmelze in dem Abstichkanal während eines Abstichvorganges auch ohne Zusatzheizung verhindert wird.Based on this prior art, the present invention seeks to further develop a known furnace with a tapping channel to the effect that a freezing or freezing of a melt in the tapping channel is prevented during a Abstichvorganges without additional heating.

Lösungsolution

Diese Aufgabe wird durch den Gegenstand des Patentanspruchs 1 gelöst. Demnach ist ein erfindungsgemäßer Schmelzofen dadurch gekennzeichnet, dass ein Teil des Abstichkanals über das Niveau des Bodens des Gefäßes hinaus in das Innere des Gefäßes hineinragend ausgebildet ist.This object is solved by the subject matter of patent claim 1. Accordingly, a melting furnace according to the invention is characterized in that a part of the tapping channel is formed projecting beyond the level of the bottom of the vessel into the interior of the vessel.

Eine derartige Ausbildung des Abstichkanals bietet den Vorteil, dass in dem Gefäß vorhandene Schmelze den in das Gefäß hineinragenden Teil des Abstichkanals umspült und auf diese Weise automatisch aufwärmt. Bei einem Abstichvorgang wird der Abstichkanal dann nicht nur durch in seinem Innern abfließende Schmelze, sondern auch durch an seiner Außenseite befindliche Schmelze erwärmt. Das Risiko eines Ein- oder Anfrierens der Schmelze ist dadurch gebannt.Such a design of the tapping channel has the advantage that existing in the vessel melt flows around the projecting into the vessel part of the tapping channel and automatically warms up in this way. During a tapping operation, the tapping channel is then heated not only by melt flowing away in its interior, but also by melt located on its outside. The risk of freezing or freezing of the melt is thereby eliminated.

Gemäß einem ersten vorteilhaften Ausführungsbeispiel weist der Schmelzofen eine Abdeckhaube auf, welche über den in das Innere des Gefäßes hineinragenden Teil des Abstichkanals gestülpt bzw. verfahren werden kann. Es ist dann zum Beispiel ein Evakuieren eines von der Abdeckhaube aufgespannten Volumens, in das auch der in das Innere des Gefäßes hineinragende Teil des Abstichkanals hineinragt, möglich. Auf diese Weise ist es möglich, bei einem Abstichvorgang Schmelze auch dann noch in den Abstichkanal hinein anzusaugen, wenn deren Pegel außerhalb der Abdeckhaube im Innern des Gefäßes unter die Oberkante des in das Innere des Gefäßes hineinragenden Teils des Abstichkanals, aber noch nicht unter die Unterkante der Abdeckhaube gesunken ist.According to a first advantageous embodiment, the melting furnace has a covering hood, which can be slipped or moved over the part of the tapping channel projecting into the interior of the vessel. It is then, for example, an evacuation of a spanned by the cover volume, into which also protrudes into the interior of the vessel projecting part of the tapping channel, possible. In this way it is possible to suck in a tapping melting even in the tapping channel into it, if their level outside the cover inside the vessel below the top of the projecting into the interior of the vessel portion of the tapping channel, but not below the lower edge the cover has sunk.

Die Abdeckhaube ist vorteilhafterweise mit einem Versorgungskanal verbunden, über welchen zum Beispiel Gas in das von der Abdeckhaube aufgespannte Volumen oder Granulat in den Abstichkanal verbracht werden kann. Außerdem kann durch den Versorgungskanal das bereits erwähnte Evakuieren des von der Abdeckhaube aufgespannten Volumens realisiert werden.The cover is advantageously connected to a supply channel, via which, for example, gas can be brought into the volume or granulate spanned by the covering hood into the tapping channel. In addition, the already mentioned evacuation of the volume spanned by the cover can be realized by the supply channel.

Insbesondere zur Ausbildung eines Vakuums beim Evakuieren während eines Abstichvorganges muss die Abdeckhaube gasdicht mit der Schmelze abschließen; zu diesem Zweck wird zumindest ihr unterer Rand bei jedem Abstichvorgang in die Schmelze eingetaucht, was einen hohen Verschleiß von insbesondere diesem Rand zur Folge hat. Es ist deshalb vorteilhaft, wenn die Abdeckhaube lösbar mit dem Versorgungskanal verbunden ist, um sie bei zu großem Verschleiß einfach austauschen zu können.In particular, for the formation of a vacuum during evacuation during a tapping process, the cover must be gas-tight with the melt; For this purpose, at least its lower edge is immersed in each tapping in the melt, which has a high wear of particular this edge result. It is therefore advantageous if the cover is detachably connected to the supply channel in order to be able to easily replace it in case of excessive wear.

Es ist von Vorteil, die Abdeckhaube vorzugsweise zusammen mit dem Versorgungskanal verfahrbar auszubilden, um die Abdeckhaube dann, wenn sie nicht für einen Abstichvorgang benötigt wird, aus der Schmelze oder gänzlich aus dem Gefäß heraus zu verfahren, weil sie dann keinem Verschleiß durch die Schmelze unterliegt.It is advantageous for the cover preferably to be movable together with the supply channel in order to move the cover out of the melt or completely out of the vessel, if it is not required for a tapping operation, because then it is not subject to wear by the melt ,

Weil die Abdeckhaube aus den genannten Gründen bei dem Abstichvorgang in die Schmelze eingetaucht wird, muss sie als Ganzes oder zumindest ihre äußere Beschichtung feuerfest ausgebildet sein.Because the cover is immersed in the tapping process in the melt for these reasons, it must be made fireproof as a whole or at least their outer coating.

Vorteilhafterweise umfasst der Schmelzofen einen Schlackensensor zum Erfassen von unter die Abdeckhaube strömender Schlacke und/oder einen Schmelzenpegelsensor zum Erfassen des Pegels der Schmelze unter der Abdeckhaube. Vorteilhafterweise kann dann der Fluss der Schmelze während eines Abstichvorganges in dem Abstichkanal durch Steuern des Gasgehaltes oder des Vakuums unter der Abdeckhaube im Ansprechen auf Messsignale dieses Schlackensensors und/oder dieses Schmelzenpegelsensors gesteuert werden.Advantageously, the melting furnace comprises a slag sensor for detecting slag flowing under the cover hood and / or a melt level sensor for detecting the level of the melt under the cover hood. Advantageously, then the flow of the melt during a tapping operation in the tapping channel by controlling the gas content or the vacuum under the cover can be controlled in response to measurement signals of this slag sensor and / or this melt level sensor.

Vorteilhafterweise ist der über das Bodenniveau des Gefäßes in das Innere des Gefäßes hineinragende Teil des Abstichkanals mit dem restlichen Teil des Abstichkanals lösbar verbunden, weil dann eine Rest- oder Notentleerung des Gefäßes durch mechanische Beseitigung des in das Gefäß hineinragenden Teils des Abstichkanals möglich ist.Advantageously, the over the bottom level of the vessel into the interior of the vessel projecting part of the tapping channel with the remaining part of the tapping channel is releasably connected, because then a residual or emergency emptying of the vessel by mechanical elimination of the projecting into the vessel part of the tapping channel is possible.

Vorteilhafterweise ist das Gefäß, in dessen Boden der Abstichkanal vorgesehen ist, als Gefäßerker ausgebildet und zumindest über einen Kanal so mit einer Ofenwanne des Schmelzofens verbunden, dass die Schmelze bei einem Abstichvorgang aus der Wanne in das Gefäß beziehungsweise den Gefäßerker fließt.Advantageously, the vessel, in the bottom of the tapping channel is provided, formed as a vessel core and at least connected via a channel with a furnace trough of the furnace so that the melt flows during a tapping from the trough into the vessel or the vessel core.

Der Abstich kann vorteilhafterweise bei kippbaren Öfen notfalls auch ohne Stempel zuverlässig ausgeführt werden.The tapping can advantageously be carried out reliably in tiltable ovens, if necessary, even without a stamp.

Vorteilhafterweise lassen sich herkömmliche Schmelzöfen mit exzentrischem oder zentrischem Bodenabstich mit einem erfindungsgemäß ausgebildeten Abstichkanal und vorzugsweise auch mit einer zugeordneten erfindungsgemäßen Abdeckhaube ausstatten.Advantageously, conventional melting furnaces with eccentric or centric bottom tap can be equipped with a tap channel designed according to the invention and preferably also with an associated cover hood according to the invention.

Die oben genannte Aufgabe wird weiterhin durch ein Verfahren zum Betreiben eines Schmelzofens gelöst. Die Vorteile dieses Verfahrens entsprechen im Wesentlichen den oben mit Bezug auf den beanspruchten Schmelzofen genannten Vorteilen. Ergänzend sei angemerkt, dass der Abstichvorgang vorteilhafterweise durch ein Einbringen von Inertgas in das durch die Abdeckhaube aufgespannte Volumen gestoppt, gesteuert oder unterbrochen werden kann.The above object is further achieved by a method for operating a melting furnace. The advantages of this process are essentially the same as those mentioned above with respect to the claimed furnace. In addition, it should be noted that the tapping advantageously can be stopped by the introduction of inert gas in the spanned by the cover volume, controlled or interrupted.

Weitere vorteilhafte Ausgestaltungen des beanspruchten Schmelzofens und des beanspruchten Verfahrens sind Gegenstand der abhängigen Ansprüche.Further advantageous embodiments of the claimed melting furnace and the claimed method are the subject of the dependent claims.

Der Beschreibung sind insgesamt 3 Figuren beigefügt, wobeiThe description is a total of 3 figures attached, wherein

Fig. 1
einen Gefäßerker für einen Schmelzofen gemäß der Erfindung;
Fig. 2a - 2e
verschiedene Verfahrpositionen einer Abdeckhaube mit einem Versorgungskanal während eines Abstichvorganges;
Fig. 3a und 3b
das Eindringen von Schlacke unter die Abdeckhaube und das Steuern eines Abstichvorganges beim Eindringen der Schlacke unter die Haube;
zeigt.
Fig. 1
a vessel core for a melting furnace according to the invention;
Fig. 2a - 2e
different travel positions of a cover with a supply channel during a tapping operation;
Fig. 3a and 3b
the penetration of slag under the cover and controlling a Abstichvorganges when the slag penetrates under the hood;
shows.

Ausführungsbeispieleembodiments

Die Erfindung wird nachfolgend in Form von Ausführungsbeispielen unter Bezugnahme auf die genannten Figuren detailliert beschrieben.The invention will now be described in detail in the form of embodiments with reference to said figures.

Figur 1 zeigt ein als Gefäßerker ausgebildetes Gefäß 100 eines Schmelzofens (nicht gezeigt) zum Aufnehmen von zumindest einem Teil einer Schmelze. Der Gefäßerker ist typischerweise an einer Abschlusswand einer Ofenwanne des Schmelzofens montiert, in welcher sich zunächst der größte Teil der Schmelze sammelt. Die Ofenwanne ist jedoch mit dem Gefäßerker verbunden, so dass zumindest bei einem Abstichvorgang die Schmelze 200 auch in das Gefäß 100 beziehungsweise in den Gefäßerker gelangen kann.FIG. 1 shows a vessel 100 of a melting furnace (not shown), designed as a vessel core, for receiving at least part of a melt. The vessel core is typically mounted on an end wall of an oven trough of the furnace, in which initially collects most of the melt. However, the furnace trough is connected to the vessel core, so that at least during a tapping process the melt 200 can also enter the vessel 100 or the vessel core.

Diese Situation ist in Figur 1 dargestellt. Es ist zu erkennen, dass der Gefäßerker einen Abstichkanal 110 im Boden des Gefäßes 100 aufweist, wobei ein Teil 112 des Abstichkanals 110 erfindungsgemäß über das Niveau des Bodens B des Gefäßes 100 hinaus in das Innere des Gefäßes hineinragend ausgebildet ist. Dem Abstichkanal 110 zugeordnet ist eine Abdeckhaube 300, welche mit einem Versorgungskanal 310 verbunden ist und zusammen mit diesem in vertikaler Richtung verfahrbar ist. In Figur 1 ist die Abdeckhaube zusammen mit dem Versorgungskanal 310 soweit in Richtung Abstichkanal 110 verfahren, dass sie über den in das Innere des Gefäßerkers hineinragenden Teil 112 des Abstichkanals 110 gestülpt ist. Dabei ist es wichtig, dass zwischen der Innenseite der Abdeckhaube 300 und dem Boden B des Gefäßes sowie der Außenseite des Teils 112 immer noch ein ausreichend großer Abstand verbleibt, um, wie weiter unten erklärt wird, einen siphonartigen Fleißkanal für die Schmelze 200 freizuhalten. Es ist dann ein Ansaugen der Schmelze 200 unter die Abdeckhaube 300 beziehungsweise in das von ihr aufgespannte Volumen sowie ein Abfließen der Schmelze in Pfeilrichtung in Form eines Abstichstrahles 116 durch den geöffneten Abstichkanal 110 möglich. Der Abstichkanal 110 ist in Figur 1 geöffnet, weil ein Abstichschieber 114 den Abstichkanal 110 nicht verschließt, sondern beiseite geschoben ist.This situation is shown in FIG. It can be seen that the vessel core has a tapping channel 110 in the bottom of the vessel 100, wherein a part 112 of the tapping channel 110 according to the invention is formed projecting beyond the level of the bottom B of the vessel 100 into the interior of the vessel. the Associated tapping channel 110 is a cover 300, which is connected to a supply channel 310 and is movable together with this in the vertical direction. In FIG. 1, the cover hood, together with the supply channel 310, has moved so far in the direction of the tapping channel 110 that it is slipped over the part 112 of the tapping channel 110 projecting into the interior of the vessel core. It is important that between the inside of the cover 300 and the bottom B of the vessel and the outside of the part 112 still remains a sufficiently large distance to, as explained below, a siphon-like working channel for the melt 200 indemnify. It is then a suction of the melt 200 under the cover 300 or in the space spanned by her volume and a flow of the melt in the direction of arrow in the form of a tapping stream 116 through the open tapping channel 110 is possible. The tapping channel 110 is opened in FIG. 1 because a tapping slide 114 does not close the tapping channel 110, but is pushed aside.

Wie in Figur 1 zu erkennen ist, ragt die Abdeckhaube 300 während eines Abstichvorganges zumindest zeitweise in die Schmelze 200 hinein. Es ist deshalb wichtig, dass die Abdeckhaube 300 oder zumindest eine äußere Beschichtung der Abdeckhaube feuerfest ausgebildet ist. An den Versorgungskanal 310 ist eine Evakuierungsleitung 800 zum Evakuieren eines Gasraumes 350 als Teil des von der Abdeckhaube 300 aufgespannten Volumens 320 angeschlossen. Der Gasraum bildet sich typischerweise in einem zwischen der Oberfläche der angesaugten Schmelze 200 und dem verbleibenden Restvolumen unter der Abdeckhaube und innerhalb des Versorgungskanals 310 aus.As can be seen in FIG. 1, the cover hood 300 projects into the melt 200 at least temporarily during a tapping operation. It is therefore important that the cover 300 or at least an outer coating of the cover is fireproof. An evacuation line 800 for evacuating a gas space 350 as part of the volume 320 spanned by the cover 300 is connected to the supply channel 310. The gas space is typically formed in a between the surface of the sucked melt 200 and the remaining volume under the cover and within the supply channel 310.

Weiterhin ist der Versorgungskanal 310 an eine Gasleitung 900 angeschlossen zum Einbringen von Inertgas in das von der Abdeckhaube 300 aufgespannte Volumen beziehungsweise in den verbleibenden Gasraum 350 als Teil dieses Volumens.Furthermore, the supply channel 310 is connected to a gas line 900 for introducing inert gas into the volume spanned by the cover 300 or into the remaining gas space 350 as part of this volume.

Nachfolgend wird der Betrieb des Schmelzofens mit einem Gefäßerker gemäß Figur 1 bei einem Abstichvorgang näher erläutert.The operation of the melting furnace with a vessel core according to FIG. 1 during a tapping process will be explained in more detail below.

Figur 2a zeigt eine typische Ausgangssituation zu Beginn eines Abstichvorganges. Schmelze 200, die durch Einschmelzen eines Einsatzes in dem Schmelzofen entstanden ist, sammelt sich nicht nur in dessen Ofenwanne, sondern aufgrund einer Kanalverbindung (nicht gezeigt) zwischen der Ofenwanne und dem Gefäß 100 auch in diesem. In Figur 2a ist zu erkennen, dass der Pegel P der Schmelze deutlich über der Oberkante O des in das Innere des Gefäßerkers hineinragenden Teils 112 des Abstichkanals 110 liegt. Der Abstichkanal 110 ist in Figur 2a mit Granulat 700 verfüllt und durch den vor den Abstichkanal 110 geschobenen Abstichschieber 114 verschlossen, so dass die Schmelze 200 nicht durch den Abstichkanal 110 entweichen kann. Die Abdeckhaube 300 ist beispielhaft ein Stück weit in die Schmelze 200 eingetaucht.FIG. 2a shows a typical starting situation at the beginning of a tapping process. Melt 200, which has formed by melting an insert in the furnace, not only collects in the furnace trough, but also due to a channel connection (not shown) between the furnace trough and the vessel 100 in this. In FIG. 2 a, it can be seen that the level P of the melt lies clearly above the upper edge O of the part 112 of the tapping channel 110 projecting into the interior of the vessel core. The tapping channel 110 is filled with granules 700 in FIG. 2a and closed by the tapping slide 114 pushed in front of the tapping channel 110, so that the melt 200 can not escape through the tapping channel 110. The cover 300 is immersed, for example, a little way into the melt 200.

Figur 2b zeigt einen Zustand des mit Schmelze 200 gefüllten Gefäßes 100 kurz nach Einleiten des Abstichvorganges. Der Abstichvorgang wurde dadurch eingeleitet, dass der Abstichschieber 114 im Vergleich zu Figur 2a nach rechts verschoben wurde und auf diese Weise den Abstichkanal 110 zunächst für einen Ausfluss des Granulates 700 und nachfolgend für ein Ausfließen der Schmelze 200 freigegeben hat.FIG. 2b shows a state of the vessel 100 filled with melt 200 shortly after initiation of the tapping process. The tapping process was initiated by the tapping slide 114 having been displaced to the right in comparison to FIG. 2a and thus in this way releasing the tapping channel 110 initially for outflow of the granulate 700 and subsequently for outflow of the melt 200.

Solange der Pegel P der Schmelze 200 höher liegt als die Oberkante O des Teils 112 des Abstichkanals, fließt die Schmelze 200 aufgrund der Schwerkraft automatisch durch den geöffneten Abstichkanal ab.As long as the level P of the melt 200 is higher than the upper edge O of the part 112 of the tapping channel, the melt 200 automatically flows by gravity through the opened tapping channel.

Um ein Abfließen der Schmelze 200 durch den Abstichkanal 110 auch dann noch zu ermöglichen, wenn deren Pegel P außerhalb der Abdeckhaube 300 unter das Niveau der Oberkante O des Abstichkanals 110 absinkt, wird erfindungsgemäß vorgeschlagen, die Abdeckhaube 300 mit dem Versorgungskanal soweit abzusenken, dass die Unterkante U von deren Rand in die Schmelze 200 eintaucht; siehe Fig. 2c. Die Abdeckhaube kann auch synchron mit dem sinkenden Pegel P verfahren werden. Durch das Eintauchen wird das durch die Abdeckhaube 300 aufgespannte Volumen druck- und vakuumdicht abgeschlossen. Es kann dann durch Evakuieren des Gasraums 350 und des Innern des Versorgungskanals 310 ein Unterdruck unter der Abdeckhaube 300 erzeugt werden, welcher die Schmelze 200 unter die Abdeckhaube 300 saugt und den Abfluss der Schmelze durch den Abstichkanal 110 auch dann noch aufrecht erhält. Die Evakuierung erfolgt dabei über die Evakuierungsleitung 800.In order to still allow the melt 200 to drain through the tapping channel 110, when its level P outside the cover hood 300 drops below the level of the upper edge O of the tapping channel 110, it is proposed according to the invention to lower the covering hood 300 to the supply channel as far as possible. that the lower edge U dips from the edge into the melt 200; see Fig. 2c. The cover can also be moved synchronously with the falling level P. By immersing the spanned by the cover 300 volume pressure and vacuum sealed. It can then be created by evacuating the gas space 350 and the interior of the supply channel 310, a negative pressure under the cover 300, which sucks the melt 200 under the cover 300 and the drainage of the melt through the tapping 110 still maintains. The evacuation takes place via the evacuation pipe 800.

Bei verschleißbedingter verkürzter Unterkante der Abdeckhaube 300 wird diese gegebenenfalls zusammen mit dem Versorgungskanal 310 entsprechend weiter in die Schmelze abgesenkt als bei intaktem Rand, um in jedem Fall eine Abdichtung des Innenraumes der Abdeckhaube sicherzustellen.In the event of a wear-induced shortened lower edge of the cover 300, it is optionally lowered further along with the supply channel 310 into the melt than when the edge is intact, in order to ensure a sealing of the interior of the cover in each case.

Zum Abbrechen des Abstichvorganges gibt es verschiedene Möglichkeiten, von denen eine erste in Figur 2d dargestellt ist. Diese sieht vor, dass in das Volumen oberhalb des Pegels P der Schmelze unter der Abdeckhaube 300 Inertgas über die Gasleitung 900 und den Versorgungskanal 310 eingebracht wird. Das Inertgas ist mit einem hohen Druck beaufschlagt, welcher gewährleistet, dass die Schmelze aus dem Innenraum der Haube 300 und insbesondere aus der Umgebung der Oberkante O des Abstichkanals 110 verdrängt wird. Dies hat zur Folge, dass der Pegel der Schmelze 200 auch innerhalb der Abdeckhaube 300 nicht mehr über das Niveau der Oberkante O ansteigt und damit, dass keine Schmelze mehr durch den geöffneten Abstichkanal 110 entweichen kann. Stattdessen entweicht in diesem Fall Inertgas aus dem Abstichkanal.To cancel the Abstichvorganges there are several ways, of which a first is shown in Figure 2d. This provides that in the volume above the level P of the melt under the cover 300 inert gas via the gas line 900 and the supply channel 310 is introduced. The inert gas is subjected to a high pressure, which ensures that the melt is displaced from the interior of the hood 300 and in particular from the vicinity of the upper edge O of the tapping channel 110. This has the consequence that the level of the melt 200 does not increase beyond the level of the top O even within the cover 300 and thus that no melt can escape through the opened tap channel 110. Instead, in this case, inert gas escapes from the tapping channel.

Eine in Figur 2d nicht gezeigte zweite Methode zum Abbrechen des Abstichvorganges besteht darin, dass die Abdeckhaube 300 mit dem Versorgungskanal 310 vertikal soweit verfahren wird, dass selbst ihr unterer Rand U nicht mehr in die Schmelze eintaucht. Das Innere der Abdeckhaube 300 ist dann nicht mehr gasdicht abgeschlossen und es kann Gas bzw. Luft aus dem Gefäß durch einen Spalt zwischen der Abdeckhaube 300 und dem Pegel der Schmelze in das Innere der Abdeckhaube 300 eindringen und dort die Schmelze verdrängen, genau wie das unter Bezugnahme auf Figur 2d beschriebene Inertgas.A second method, not shown in FIG. 2d, for breaking off the tapping operation is that the covering hood 300 is moved vertically with the supply channel 310 so far that even its lower edge U is no longer in the Melt dips. The interior of the cover 300 is then no longer sealed gas-tight and it can penetrate gas or air from the vessel through a gap between the cover 300 and the level of the melt in the interior of the cover 300 and displace the melt there, just like the under Referring to Figure 2d described inert gas.

Insofern eignen sich sowohl die Gasbefüllung über die Gasleitung 900 gemäß Figur 2d wie auch das Verfahren der Abdeckhaube 300 nach oberhalb des Schmelzenpegels P außerhalb der Haube zum komfortablen Abbrechen, Unterbrechen oder Steuern des Abstichvorganges beziehungsweise des Ausfließens der Schmelze 200. Der Abstichvorgang wird schließlich beendet durch Verschließen des Abstichkanals 110 mit dem Abstichschieber 114 und Befüllen des Abstichkanals 110 vorzugsweise durch den Versorgungskanal 310 mit Granulat 700 (siehe Figur 2e).In this respect, both the gas filling via the gas line 900 according to Figure 2d as well as the method of the cover 300 are above the melt level P outside the hood for comfortable breaking off, interrupting or controlling the Abstichvorganges or the outflow of the melt 200. The tapping is finally terminated by Closing the tapping channel 110 with the tapping slide 114 and filling the tapping channel 110 preferably through the supply channel 310 with granules 700 (see Figure 2e).

Nach Abschluss des Abstichvorganges wird die Abdeckhaube 300 mit dem Versorgungskanal 310 vorteilhafterweise aus der Umgebung des Abstichkanals 110 soweit weg verfahren, dass sie auch bei einer nachfolgenden Befüllung des Gefäßes 100 mit Schmelze 200 nicht zwangsläufig mit der Schmelze 200 in Verbindung kommt. Dies hat, genau wie ein vollständiges Entfernen der Abdeckhaube aus dem Innern des Gefäßerkers, den Vorteil, dass ihr Verschleiß, den sie ansonsten bei einem Eintauchen in die Schmelze erleidet, minimiert wird.After completion of the tapping operation, the cover 300 with the supply channel 310 is advantageously moved away from the surroundings of the tapping channel 110 so far that it does not necessarily come into contact with the melt 200 even when the vessel 100 is subsequently filled with melt 200. This, as well as complete removal of the cover from the interior of the vessel core, has the advantage of minimizing its wear, which it otherwise suffers when immersed in the melt.

Die Figuren 3a und 3b betreffen die Steuerung eines Abstichvorganges mithilfe einer Steuereinrichtung 600 beim Eindringen von Schlacke 210 in das Innere der Abdeckhaube 300. Zum Erkennen von eingedrungener Schlacke 210 ist vorzugsweise ein optischer Schlackensensor 400 vorgesehen, welcher die Oberfläche der Schmelze im Innern der Haube auf das Vorhandensein von Schlacke 210 hin abtastet beziehungsweise untersucht. Mit diesem Sensor lässt sich das Eindringen von Schlacke zeitnah durch Änderung der Emissivität erfassen. Wird das Eindringen beziehungsweise Nachströmen von Schlacke 210 unter die Abdeckhaube 300 erkannt, so veranlasst die Steuereinrichtung 600 im Ansprechen auf ein entsprechendes Signal des Schlackensensors 400 unverzüglich eine Unterbrechung beziehungsweise einen Abbruch des Abstichvorganges. Ein Beispiel für das Abbrechen des Abstichvorganges in diesem Fall ist in Figur 3b gezeigt, wonach die Steuereinrichtung 600 den Abbruch des Abstichvorganges durch Öffnen der Gasleitung 900 einleitet; vergleiche die obige Beschreibung eines Abbruchs des Abstechvorganges gemäß Figur 2d. Dabei wird Inertgas unter Druck in den Versorgungskanal 310 und den Gasraum 350 im Innern der Abdeckhaube oberhalb der Schlacke 210 eingebracht, wodurch die Schmelze mit der auf ihr schwimmenden Schlacke 210 zumindest weitgehend aus dem durch die Abdeckhaube 300 aufgespannten Volumen und dem Abstichkanal verdrängt wird. Die relativ kleinen Schlackenvolumen unterhalb der Abdeckhaube 300 führen zu besonders kleinen Schlackenresten 210-R beim Abstich.FIGS. 3a and 3b relate to the control of a tapping process by means of a control device 600 when slag 210 penetrates into the interior of the cover hood 300. To detect slag 210 that has entered, an optical slag sensor 400 is preferably provided, which houses the surface of the melt inside the hood the presence of slag 210 is scanned or investigated. With this sensor, the penetration of slag can be detected promptly by changing the emissivity. Will the intrusion or afterflow of slag 210 detected under the cover 300, the control device 600 causes in response to a corresponding signal of the slag sensor 400 immediately interrupting or canceling the Abstichvorganges. An example of the cancellation of the tapping operation in this case is shown in Figure 3b, after which the control means 600 initiates the termination of the tapping operation by opening the gas pipe 900; Compare the above description of a termination of the parting off process according to FIG. 2d. Inert gas is introduced under pressure into the supply channel 310 and the gas space 350 in the interior of the cover above the slag 210, whereby the melt is at least largely displaced from the volume spanned by the cover 300 and the tapping channel with the slag 210 floating on it. The relatively small slag volume below the cover 300 lead to particularly small slag residues 210-R during tapping.

Bei einem Siphonbetrieb, wie in den Figuren 2c-2e und 3a, b gezeigt, kann der Schmelzenfluss dadurch präziser gesteuert werden kann, dass mindestens ein Schmelzenpegelsensor in der Abdeckhaube 300 oder in dem Versorgungskanal 310 angebracht ist zum Erfassen des Pegels der Schmelze 200 unter der Abdeckhaube 300. Nach Maßgabe der Höhe des von dem Schmelzenpegelsensor 500 gemessenen Pegels wird dann die Verfahrposition der Abdeckhaube 300 und des Versorgungskanals 310 durch die Steuereinrichtung 600 gesteuert. Der Schmelzpegelsensor kann als Abstandsensor ausgebildet sein, welcher den Pegel P der Schmelze 200 vorzugsweise durch den Versorgungskanal 310 hindurch erfasst. Alternativ kann der Schmelzpegelsensor 500 in Form von vorzugsweise mehreren bei verschiedenen Pegelhöhen im Innern der Abdeckhaube 300 angebrachten Kontakten ausgebildet sein, welche bei Kontakt mit der Schmelze 200 ein elektrisches Signal für die Steuereinrichtung 600 erzeugen. Altemativ dazu kann der Schmelzenpegelsensor auch als Unterdrucksensor ausgebildet sein, welcher den Pegel der Schmelze 200 unter der Abdeckhaube 300 nach Maßgabe der Größe des Unterdrucks oder nach Maßgabe einer Änderung des Unterdrucks unter der Abdeckhaube erfasst. Ein Indiz dafür, dass die Unterkante U der Abdeckhaube 300 beim Absenken der Abdeckhaube 300 den Pegel P der Schmelze 200 erreicht hat, ist dann gegeben, wenn der Innenraum der Abdeckhaube 300 während des Absenkens der Haube evakuiert wird und der Schmelzenpegelsensor 500 zu einem bestimmten Zeitpunkt einen plötzlichen Abfall des Druckes im Innern der Haube feststellt. Der Abfall des Druckes basiert dann auf einem Verschließen des Innenraumes der Haube 300 in der Weise, dass die Unterkante der Haube in die Schmelze eintaucht. Ab diesem Zeitpunkt kann dann der Evakuierungsvorgang zum Ansaugen der Schmelze in das Innere der Haube 300 wie oben beschrieben fortgesetzt werden beziehungsweise erfolgen.In a siphon operation, as shown in FIGS. 2c-2e and 3a, b, the melt flow may be more precisely controlled by having at least one melt level sensor mounted in the cover 300 or in the supply channel 310 for detecting the level of the melt 200 below Covering hood 300. In accordance with the level of the level measured by the melt level sensor 500, the traveling position of the cover hood 300 and the supply passage 310 is then controlled by the control device 600. The melt level sensor may be formed as a distance sensor, which preferably detects the level P of the melt 200 through the supply channel 310. Alternatively, the melt level sensor 500 may be formed in the form of preferably a plurality of contacts mounted at different levels within the cover 300, which in contact with the melt 200 generates an electrical signal to the controller 600. Alternatively, the melt level sensor can also be designed as a vacuum sensor, which determines the level of the melt 200 under the cover 300 in accordance with the size of the negative pressure or in accordance with a change in the negative pressure detected under the cover. An indication that the lower edge U of the cover 300 has reached the level P of the melt 200 when lowering the cover 300, is given when the interior of the cover 300 is evacuated during the lowering of the hood and the melt level sensor 500 at a certain time detects a sudden drop in pressure inside the hood. The drop in pressure is then based on closing the interior of the hood 300 in such a way that the lower edge of the hood dips into the melt. From this point on, the evacuation process for sucking the melt into the interior of the hood 300 can then continue or take place as described above.

Ein Siphonbetrieb bringt aufgrund der damit verbundenen mehrfachen Fließrichtungsumleitung der Schmelze immer einen höheren Fließwiderstand mit sich als ein gradliniger Abstichkanal. Das beschriebene Konzept zur Steuerung eines Abstichvorganges zeichnet sich jedoch insgesamt durch einen vergleichsweise widerstandsarmen Abfluss der Schmelze 200 aus, weil die Schmelze zu Beginn eines Abstichvorganges, das heißt zumindest solange ihr Pegel P über der Oberkante O des Teils 112 liegt, aufgrund der Schwerkraft durch den gradlinigen Abstichkanal 110 relativ reibungsfrei abfließen kann und ein Siphonbetrieb mit größerem Fließwiderstand während dieser Zeit vermieden wird. Gemäß der vorliegenden Erfindung wird ein Siphonbetrieb durch Absenken der Haube 300 über den Teil 112 des Abstichkanals 110 nur gegen Ende des Abstichvorganges vorgeschlagen, wenn der Pegel der Schmelze P zwischen dem Niveau der Oberkante des Teils 112 und dem Niveau der Unterkante der Abdeckhaube 300 liegt. Über den gesamten Abstichzeitraum gesehen ist deshalb der Fließwiderstand bei dem beschriebenen Abstichkonzept wesentlich geringer als bei einem erfindungsgemäßen alternativen stationären Siphonbetrieb, bei dem die Abdeckhaube feststehend über den Teil 112 gestülpt und nicht verfahrbar ausgebildet wäre.A siphon operation always brings a higher flow resistance due to the associated multiple flow direction diversion of the melt than a straight tapping channel. However, the described concept for controlling a tapping process is characterized overall by a comparatively low-resistance outflow of the melt 200, because the melt at the beginning of a Abstichvorganges, that is, at least as long as their level P is above the upper edge O of the part 112, due to gravity through the rectilinear tapping channel 110 can flow relatively frictionless and a siphon operation with greater flow resistance during this time is avoided. According to the present invention, a siphon operation is proposed by lowering the hood 300 over the part 112 of the tapping channel 110 only towards the end of the tapping operation, when the level of the melt P is between the level of the top edge of the part 112 and the level of the bottom edge of the cover 300. Seen over the entire Abstichzeitraum therefore the flow resistance in the tapping concept described is much lower than in an alternative stationary siphon operation according to the invention, in which the cover would be fixedly placed over the part 112 and formed not movable.

Claims (17)

Schmelzofen, beispielsweise Lichtbogenofen, zum Erzeugen einer Schmelze (200), umfassend
ein Gefäß (100) zum Aufnehmen von zumindest einem Teil der Schmelze (200); und
einen Abstichkanal (110) im Boden des Gefäßes zum Abstechen der Schmelze;
dadurch gekennzeichnet,
dass ein Teil (112) des Abstichkanals (110) über das Niveau des Bodens (B) des Gefäßes (100) hinaus in das Innere des Gefäßes hineinragend ausgebildet ist.A melting furnace, for example an electric arc furnace, for producing a melt (200)
a vessel (100) for receiving at least a portion of the melt (200); and
a tapping channel (110) in the bottom of the vessel for tapping off the melt;
characterized,
that a part (112) of the tapping channel (110) above the level of the bottom (B) of the vessel (100) is also formed projecting into the interior of the vessel. Schmelzofen nach Anspruch 1,
gekennzeichnet durch,
eine Abdeckhaube (300), welche über den in das Innere des Gefäßes hineinragenden Teil (112) des Abstichkanals (110) verfahrbar ist.Melting furnace according to claim 1,
characterized by,
a cover hood (300), which can be moved over the part (112) of the tapping channel (110) projecting into the interior of the vessel. Schmelzofen nach Anspruch 2,
gekennzeichnet durch,
mindestens einen mit der Abdeckhaube (300) verbunden Versorgungskanal (310) zum Zuführen von Gas in ein von der Abdeckhaube aufgespanntes Volumen (320) oder zum Evakuieren dieses Volumens oder zum Zuführen von Granulat durch das Innere der Abdeckhaube (300) hindurch in den Abstichkanal (110), um diesen zu verschließen.Melting furnace according to claim 2,
characterized by
at least one supply duct (310) connected to the cover hood (300) for supplying gas into a volume (320) spanned by the cover hood or for evacuating this volume or for supplying it Granules through the interior of the cover (300) into the tapping channel (110) to close it. Schmelzofen nach Anspruch 3,
dadurch gekennzeichnet,
dass die Abdeckhaube (300) lösbar mit dem Versorgungskanal (310) verbunden ist.Melting furnace according to claim 3,
characterized,
that the protective cover (300) is releasably connected to the supply channel (310). Schmelzofen nach einem der vorangegangenen Ansprüche,
dadurch gekennzeichnet,
dass die Abdeckhaube (300) oder zumindest eine äußere Beschichtung der Abdeckhaube zum Eintauchen in die Schmelze (200) feuerfest ausgebildet ist.Melting furnace according to one of the preceding claims,
characterized,
in that the cover (300) or at least an outer coating of the cover hood is designed fireproof for immersion in the melt (200). Schmelzofen nach einem der vorangegangenen Ansprüche,
gekennzeichnet durch,
einen Schlackensensor (400) zum vorzugsweise optischen Erfassen von unter die Abdeckhaube (300) strömender Schlacke.Melting furnace according to one of the preceding claims,
characterized by
a slag sensor (400) for preferably optically detecting slag flowing under the cover (300). Schmelzofen nach einem der vorangegangenen Ansprüche,
gekennzeichnet durch,
mindestens einen Schmelzenpegelsensor (500) zum Erfassen des Pegels der Schmelze (200) unter der Abdeckhaube (300).Melting furnace according to one of the preceding claims,
characterized by
at least one melt level sensor (500) for detecting the level of the melt (200) under the cover (300). Schmelzofen nach Anspruch 7,
dadurch gekennzeichnet,
dass der Schmelzenpegelsensor (500)
als Abstandssensor ausgebildet ist, welcher den Pegel der Schmelze (200) vorzugsweise durch den Versorgungskanal (310) hindurch erfasst; oder
in Form von vorzugsweise mehreren bei verschiedenen Pegelhöhen im Innern der Abdeckhaube (300) angebrachten Kontakten ausgebildet ist, welche bei Kontakt mit der Schmelze ein elektrisches Signal erzeugen; oder
als Unterdrucksensor ausgebildet ist, welcher den Pegel der Schmelze unter der Abdeckhaube (300) nach Maßgabe der Größe des Unterdrucks oder nach Maßgabe einer Änderung des Unterdrucks unter der Abdeckhaube erfasst.Melting furnace according to claim 7,
characterized,
that the melt level sensor (500)
is formed as a distance sensor which detects the level of the melt (200) preferably through the supply channel (310); or
in the form of preferably several at different levels heights inside the cover (300) mounted contacts is formed, which generate an electrical signal upon contact with the melt; or
is formed as a vacuum sensor which detects the level of the melt under the cover (300) in accordance with the size of the negative pressure or in accordance with a change in the negative pressure under the cover. Schmelzofen nach einem der vorangegangenen Ansprüche,
dadurch gekennzeichnet,
dass derjenige Teil (112) des Abstichkanals (110), welcher im Wesentlichen vom Bodenniveau der Schmelze aus in das Innere des Gefäßes (110) hineinragend ausgebildet ist, mit dem restlichen Teil des Abstichkanals (110) lösbar verbunden ist.Melting furnace according to one of the preceding claims,
characterized,
in that that part (112) of the tapping channel (110) which is substantially projecting from the bottom level of the melt into the interior of the vessel (110) is detachably connected to the remaining part of the tapping channel (110). Schmelzofen nach einem der vorangegangenen Ansprüche,
gekennzeichnet durch,
eine Steuereinrichtung (600) zum Steuern des Flusses der Schmelze in dem Abstichkanal (110) durch Steuern des Gasgehaltes oder des Vakuums unter der Abdeckhaube (300) im Ansprechen auf Signale des Schlackensensors (400) und/oder des Schmelzenpegelsensors (500).Melting furnace according to one of the preceding claims,
characterized by
control means (600) for controlling the flow of the melt in the tapping passage (110) by controlling the gas content or vacuum under the shroud (300) in response to signals from the slag sensor (400) and / or the melt level sensor (500). Schmelzofen nach einem der vorangegangenen Ansprüche,
dadurch gekennzeichnet,
dass das Gefäß (100) als Gefäßerker ausgebildet ist, in dessen Boden der Abstichkanal (110) vorgesehen ist und wobei der Gefäßerker so mit einer Schmelzenwanne des Schmelzofens verbunden ist, dass die Schmelze (200) bei einem Abstichvorgang aus der Wanne in das Gefäß (100) fließt.Melting furnace according to one of the preceding claims,
characterized,
in that the vessel (100) is designed as a vessel core, in the bottom of which the tapping channel (110) is provided, and wherein the vessel core is connected to a melting trough of the melting furnace such that the melt (200) is tapped from the trough into the vessel ( 100) flows. Verfahren zum Betreiben eines Schmelzofens mit einem Gefäß (100) zum Aufnehmen von zumindest einem Teil einer Schmelze (200) und einem Abstichkanal (110) im Boden des Gefäßes zum Abstechen der Schmelze, umfassend den Schritt: Erzeugen der Schmelze (200) durch Einschmelzen eines Einsatzes in dem Gefäß (100) dadurch gekennzeichnet,
dass die Schmelze (200) in dem Gefäß (100) einen in das Gefäß hineinragenden Teil (112) des Abstichkanals (110) zumindest teilweise von außen umspült.A method of operating a melting furnace having a vessel (100) for receiving at least a portion of a melt (200) and a tapping channel (110) in the bottom of the vessel for tapping the melt, comprising the step of: Producing the melt (200) by melting an insert in the vessel (100) characterized,
that the melt (200) in the vessel (100) projecting into the vessel part (112) of the tapping channel (110) at least partially flows around the outside. Verfahren nach Anspruch 12,
gekennzeichnet durch,
Positionieren einer nach unten offenen Abdeckhaube (300) bereits vor oder erst während eines Abstichvorganges so, dass zumindest ein unterer Rand (U) der Abdeckhaube (300) in die Schmelze (200) eintaucht und dass der in das Gefäß (100) hinragende Teil (112) des Abstichkanals (110) in ein von der Abdeckhaube (300) aufgespanntes Volumen (320) hineinragt; und Evakuieren von zumindest einem Teil des aufgespannten Volumens, wenn der Pegel der Schmelze (200) während des Abstichvorganges unter die Oberkante (O) des in das Gefäß hineinragenden Teils (112) des Abstichkanals sinkt.Method according to claim 12,
characterized by
Positioning a downwardly open cover (300) already before or during a tapping operation such that at least one lower edge (U) of the cover (300) dips into the melt (200) and that the part () protruding into the vessel (100) 112) of the tapping channel (110) projects into a volume (320) spanned by the covering hood (300); and evacuating at least a portion of the deployed volume when the level of the melt (200) drops below the top edge (O) of the tapping channel portion (112) extending into the vessel during the tapping operation. Verfahren nach einem der Anspruch 12 - 13,
gekennzeichnet durch,
die Schritte: - Erkennen, wenn Schlacke (210) auf der Schmelze (200) unter die Abdeckhaube (300) eindringt; und - Stoppen des Abstichvorganges, wenn dies erkannt wird. Method according to one of the claims 12-13,
characterized by
the steps: - Detecting when slag (210) on the melt (200) under the cover (300) penetrates; and - Stop the tapping process when this is detected. Verfahren nach einem der Ansprüche 13 oder 14,
dadurch gekennzeichnet,
dass ein Stoppen oder Unterbrechen des Abstichvorganges erfolgt durch Einbringen von Inertgas in das durch die Abdeckhaube aufgespannte Volumen, wodurch der Pegel der Schmelze dann vorzugsweise auf ein Niveau zwischen der Oberkante (O) des in das Gefäß (100) hineinragenden Teils (112) des Abstichkanals und dem unteren Rand (U) der Abdeckhaube (300) absinkt.Method according to one of claims 13 or 14,
characterized,
that stopping or interrupting the tapping is carried out by introducing inert gas into the plane spanned by the cover hood volume, whereby the level of the melt then preferably to a level between the upper edge (O) of in the vessel (100) protruding portion (112) of the tapping channel and the lower edge (U) of the cover (300) decreases. Verfahren nach einem der Ansprüche 13 - 15,
dadurch gekennzeichnet,
dass die Abdeckhaube (300) dann, wenn kein Abstichvorgang erfolgt, nach außerhalb der Schmelze (200) oder nach außerhalb des Gefäßes (100) verfahren wird.Method according to one of claims 13-15,
characterized,
that the cover (300), if no tapping occurs, is moved to outside the melt (200) or to the outside of the vessel (100). Verfahren nach einem der Ansprüche 13-16,
gekennzeichnet durch,
das Einbringen von Granulat (700) durch die Abdeckhaube (300) hindurch in den Abstichkanal (110) um diesen zu verschließen.Method according to one of claims 13-16,
characterized by
the introduction of granules (700) through the cover (300) into the tapping channel (110) to close this.
EP06014231A 2005-07-16 2006-07-10 Melting furnace and method of its operation Not-in-force EP1743948B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005033287A DE102005033287A1 (en) 2005-07-16 2005-07-16 Melting furnace and method of operation

Publications (3)

Publication Number Publication Date
EP1743948A2 true EP1743948A2 (en) 2007-01-17
EP1743948A3 EP1743948A3 (en) 2009-03-18
EP1743948B1 EP1743948B1 (en) 2010-10-27

Family

ID=37441987

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06014231A Not-in-force EP1743948B1 (en) 2005-07-16 2006-07-10 Melting furnace and method of its operation

Country Status (3)

Country Link
EP (1) EP1743948B1 (en)
AT (1) ATE486141T1 (en)
DE (2) DE102005033287A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015043910A1 (en) * 2013-09-30 2015-04-02 Siemens Vai Metals Technologies Gmbh Vessel lower part, a metallurgical vessel formed therewith and also an electric arc furnace and method for the operation thereof
WO2019116333A1 (en) * 2017-12-15 2019-06-20 Danieli & C. Officine Meccaniche S.P.A. Melting furnace for metallurgical plant and operating method therefor

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU727326A1 (en) 1977-06-22 1980-04-17 Краматорский Научно-Исследовательский И Проектно-Технологический Институт Машиностроения Apparatus for discharging metal from ladle
EP1850081A1 (en) 2005-02-09 2007-10-31 Techcom Import-Export Gmbh Method for removing a molten metal main portion from a metal-meting container through an outflow opening embodied in the bottom surface thereof, a metal-melting container and a flowchart of main operations for carrying out said method

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1181491B1 (en) * 1999-04-01 2003-08-06 Arcmet Technologie Gmbh Metallurgical vessel comprising a tapping device and method for the controlled, slag-free extraction of molten metal from said vessel
TW574495B (en) * 2001-09-26 2004-02-01 Sms Demag Ag Arc furnace and method for operating the arc furnace

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU727326A1 (en) 1977-06-22 1980-04-17 Краматорский Научно-Исследовательский И Проектно-Технологический Институт Машиностроения Apparatus for discharging metal from ladle
EP1850081A1 (en) 2005-02-09 2007-10-31 Techcom Import-Export Gmbh Method for removing a molten metal main portion from a metal-meting container through an outflow opening embodied in the bottom surface thereof, a metal-melting container and a flowchart of main operations for carrying out said method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015043910A1 (en) * 2013-09-30 2015-04-02 Siemens Vai Metals Technologies Gmbh Vessel lower part, a metallurgical vessel formed therewith and also an electric arc furnace and method for the operation thereof
CN105723175A (en) * 2013-09-30 2016-06-29 首要金属科技奥地利有限责任公司 Vessel lower part, metallurgical vessel formed therewith and also electric arc furnace and method for the operation thereof
WO2019116333A1 (en) * 2017-12-15 2019-06-20 Danieli & C. Officine Meccaniche S.P.A. Melting furnace for metallurgical plant and operating method therefor
CN111566429A (en) * 2017-12-15 2020-08-21 丹尼尔和科菲森梅克尼齐有限公司 Smelting furnace for smelting plant and operation method thereof
RU2762438C1 (en) * 2017-12-15 2021-12-21 ДАНИЕЛИ И КО ОФФИЧИНЕ МЕККАНИКЕ С.п.А. Melting furnace for metallurgical plant and its operation method
US11390927B2 (en) * 2017-12-15 2022-07-19 Danieli & C. Officine Meccaniche S.P.A. Melting furnace for metallurgical plant and operating method therefor

Also Published As

Publication number Publication date
EP1743948A3 (en) 2009-03-18
DE502006008166D1 (en) 2010-12-09
ATE486141T1 (en) 2010-11-15
EP1743948B1 (en) 2010-10-27
DE102005033287A1 (en) 2007-01-25

Similar Documents

Publication Publication Date Title
EP1181491B1 (en) Metallurgical vessel comprising a tapping device and method for the controlled, slag-free extraction of molten metal from said vessel
EP2407260A1 (en) Device and method for melt metering and casting machine
EP1097246B1 (en) Method and device for sealing a tap hole in metallurgical containers
EP2865817A1 (en) Outlet fitting for a toilet cistern
DE1508166C2 (en) Method and device for conveying molten metal, in particular molten steel
EP1743948B1 (en) Melting furnace and method of its operation
EP2855713B1 (en) Method for opening and closing a tapping opening of a metallurgical melting vessel, and metallurgical melting vessel
DE19525389A1 (en) Zinc-removal induction melting system
DE60224674T2 (en) CASTING CONTAINER AND CASTING PROCESS
EP2743332B1 (en) Device and method for regulating and controlling individual gas pressure of a coke oven chamber
DE3215119C2 (en) Method and device for charging electric smelting or reduction furnaces
DE2620073C2 (en)
DE3327671C2 (en) Device for largely slag-free tapping of molten metal, in particular molten steel, from metallurgical vessels
EP1432834B1 (en) Method for operating a tiltable arc furnace while tapping
DE2927795A1 (en) METHOD AND DEVICE FOR FILLING A GLASS MELT WITH HIGHLY RADIOACTIVE WASTE FROM A CERAMIC MELTING FURNACE IN A REPOSITORY CONTAINER
DE19832192B4 (en) Casting plant and method for feeding molten metal to a filling chamber of a casting plant
DE19835087A1 (en) Process and device for slag-free tapping
DE19919378A1 (en) Metallurgical vessel, e.g. a tilting arc furnace, has a heated tapping siphon tube with an overflow edge located above the tube inlet upper edge in the vessel operating position
DE102008008033A1 (en) Device for slag-free tapping or for transferring a melt
EP3274641B1 (en) Device for the controlled filling of a tap opening
EP2603616B1 (en) Melt metallurgical installation comprising a charging element
DE19532040A1 (en) Device for transporting liquid metal in the casting hall of a shaft furnace and method for operating this device
DE102009033934B3 (en) Device for temporarily sealing a tap hole, which has a first internal diameter and is provided in the bottom of a metallurgical furnace, for filling the tap hole with free-flowing fire-resistant compound, comprises sealing and filling pipe
EP2803927A1 (en) Metallurgical furnace vessel and method for operating the same
DE3226110A1 (en) DRAGING BOILER EMPTYING

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20060710

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR MK YU

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR MK RS

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: SMS SIEMAG AG

17Q First examination report despatched

Effective date: 20090930

AKX Designation fees paid

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: GERMAN

REF Corresponds to:

Ref document number: 502006008166

Country of ref document: DE

Date of ref document: 20101209

Kind code of ref document: P

REG Reference to a national code

Ref country code: NL

Ref legal event code: VDEP

Effective date: 20101027

LTIE Lt: invalidation of european patent or patent extension

Effective date: 20101027

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20101027

REG Reference to a national code

Ref country code: IE

Ref legal event code: FD4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20101027

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20110127

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20110227

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20101027

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20101027

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20101027

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20110228

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20101027

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20110128

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20101027

Ref country code: IE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20101027

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20101027

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20110207

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20101027

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20101027

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20101027

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20101027

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20110728

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 502006008166

Country of ref document: DE

Effective date: 20110728

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20101027

BERE Be: lapsed

Owner name: SMS SIEMAG AG

Effective date: 20110731

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110731

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20110710

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20120330

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110801

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110731

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110731

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110731

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110710

REG Reference to a national code

Ref country code: AT

Ref legal event code: MM01

Ref document number: 486141

Country of ref document: AT

Kind code of ref document: T

Effective date: 20110710

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110710

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CY

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20101027

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110710

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20101027

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20101027

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20220620

Year of fee payment: 17

P01 Opt-out of the competence of the unified patent court (upc) registered

Effective date: 20230707

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 502006008166

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20240201